The latest State of Observed Species report is out. And biologists might have just earned the title of Hardest-Working People in Science, discovering a staggering 19,232 species in just one year, including nearly 10,000 new types of insects.

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To put that in perspective, when Carl Linnaeus began his taxonomic organization of all known species in the 1750s, there were only 10,000 known species. In 2009 alone — the most recent year the report covers — scientists were able to discover twice that number, and add significantly to the current tally of two million known species. The species were discovered by a mix of professional scientists and amateur species hunters, although hopefully not "hunters" in the traditional sense, of course.

Unsurprisingly, insects and invertebrates made up the vast majority of the newly discovered species, totaling 13,903 previously unknown species. Beetles were the most common discoveries, accounting for 3,485 in all, including 568 rove beetles, 421 ground beetles, 369 long-horned beetles, 356 leaf beetles, and 228 scarab beetles. Most of the rest of the new species were made up of plants, fungi, and microbes.

Still, it wasn't all just little stuff. 41 new mammals were discovered in 2009 alone, about half of which were bats and another third were rodents. There were also 133 new frogs, 38 lizards, 31 snakes, and two new turtles. While 43 previously unknown birds were discovered, it's hard to call most of them "new" — 34 of these species were actually fossil specimens from now extinct species. You can get another sense of the diversity of new species discovered in the cool word-cloud on the left, in which the size of each type of species reflects how many were found in 2009.

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According to the report's author, Arizona State entomologist Quentin Wheeler, there could be another 10 million species still completely unknown to science that still await discovery, but even that figure may be hopelessly low. Recent discoveries suggest far more genetic diversity, and thus more species diversity, than previously imagined, and Wheeler says this could mean another 20 million species await discovery - and that's justthe marine microbes.

In a statement, Wheeler explains that understanding just how many new species out there are helps us understanding the environment as a whole:

"As the number of species increases, so too does our understanding of the biosphere. It is through knowledge of the unique attributes of species that we illuminate the origin and evolutionary history of life on our planet. As we find out where species live and how they interact, we increase our ability to understand the function of ecosystems and make effective, fact-based decisions regarding conservation."